表达式13: "d" equals left bracket, "a" , "a" plus "d" Subscript, "x" , Baseline ... "a" plus "n" times "d" Subscript, "x" , Baseline , right bracketd=a,a+dx...a+n·dx
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表达式14: left parenthesis, "d" plus "d" Subscript, "x" , Baseline , "f" left parenthesis, "d" , right parenthesis "t" plus left parenthesis, 1 minus "t" , right parenthesis "f" left parenthesis, "d" plus "d" Subscript, "x" , Baseline , right parenthesis , right parenthesisd+dx,fdt+1−tfd+dx
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表达式15: left parenthesis, "t" left parenthesis, "d" , right parenthesis plus left parenthesis, 1 minus "t" , right parenthesis left parenthesis, "d" plus "d" Subscript, "x" , Baseline , right parenthesis , "f" left parenthesis, "d" , right parenthesis left brace, "d" less than "a" plus left parenthesis, "n" minus .0 1 , right parenthesis times "d" Subscript, "x" , Baseline , right brace , right parenthesistd+1−td+dx,fdd<a+n−.01·dx
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表达式16: left parenthesis, "t" left parenthesis, "d" , right parenthesis plus left parenthesis, 1 minus "t" , right parenthesis left parenthesis, "d" plus "d" Subscript, "x" , Baseline , right parenthesis , "f" left parenthesis, "d" , right parenthesis "t" plus left parenthesis, 1 minus "t" , right parenthesis "f" left parenthesis, "d" plus "d" Subscript, "x" , Baseline , right parenthesis , right parenthesistd+1−td+dx,fdt+1−tfd+dx
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表达式17: left parenthesis, "a" , "f" left parenthesis, "a" , right parenthesis "t" , right parenthesisa,fat
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表达式18: left parenthesis, "b" , "f" left parenthesis, "b" , right parenthesis "t" , right parenthesisb,fbt
